By Hoa Trong Tran, Gleb V. Polyakov, Anh Tuan Tran, Alexander S. Borisenko, Andrey E. Izokh, Pavel A. Balykin, Phuong Thi Ngo, Dung Thi Pham
This e-book via Vietnamese and Russian authors is the 1st of its variety and combines the vast wisdom at the petrology and metallogeny of the overdue Paleozoic – early Mesozoic and Cenozoic sessions in North Vietnam. The Permian – Triassic and Paleogene volcano-plutonic and plutonic institutions are vital geological occasions within the evolutionary heritage of Southeast Asia, together with the 260 – 250 Ma Emeishan mantle plume and Indian-Eurasia collision at 60 – fifty five M.
The quantity contains nine chapters, divided into three components. half 1 introduces the geological constitution of North Vietnam; half 2 covers the Permian – Triassic magma institutions and metallogeny; and half three specializes in the Cenozoic magma institutions and metallogeny.
In every one bankruptcy, the geological surroundings of magmas, type of other geological buildings, and composition features, akin to mineralogy, geochemistry, isotope systematics and geochronology are discussed.
This publication represents an immense reference rfile for overseas and Vietnamese geologists engaged within the geological background and metallogeny of Vietnam, an incredible region of the Asian continent. The monograph additionally has a realistic importance in contributing new premises and to evaluate infrequent and worthy mineral clients. additionally, it may be considered as an important facts base for petrological and metallogenic tasks and college courses.
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This publication through Vietnamese and Russian authors is the 1st of its type and combines the broad wisdom at the petrology and metallogeny of the past due Paleozoic – early Mesozoic and Cenozoic classes in North Vietnam. The Permian – Triassic and Paleogene volcano-plutonic and plutonic institutions are very important geological occasions within the evolutionary historical past of Southeast Asia, together with the 260 – 250 Ma Emeishan mantle plume and Indian-Eurasia collision at 60 – fifty five M.
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Additional info for Intraplate Magmatism and Metallogeny of North Vietnam
5). There is also close relationship between Os and Cr being observed in the Song Da rift volcanics except for Cr-spinel-bearing komatiitic basalts with almond-like structure. 96 ppb that show no clear relationship with MgO. Rhenium contents in the Song Da basalts are much lower compared with Gorgona basalt (1–3 ppb). In fact, Re contents in Song Da komatiites are also lower than those in Gorgona komatiites. Re and Cr in the two komatiite types do not show any clear relationship (Fig. 5). As a result of having high Os and low Re contents 34 2 Permian – Triassic Magmatic Activity in the Song Da Structure Fig.
T°C: melting temperature. g. Ryabchikov and Bogachikov 1984) showed that Iilgar-type primitive komatiitic melt was produced by 50 % partial melting of primitive mantle lherzolite at P = 35–37 kb and T = 1775–1825 °C. According to these authors Barberton-type komatiitic melt may be produced by 60–65 % partial melting of lhezolite at higher pressure and temperature, ca. 50 kb and 1875–1975 °C, respectively. They suggested that the difference between picrite – basalt and komatiite – basalt rock types depends on the variation and nature of fluids; komatiite – basalt melts are associated with ‘dry’ fluids while picrite – basalt and picrite – dolerite melts being produced under hydrous condition.
8 Fig. 7), calculated based on 250 Ma and 270 Ma, respectively. Two basaltic samples, G1436 and P73/89, show higher Os isotopic ratios compared with the initial γOs from +18 to +58. The initial γOs data in komatiites are nearly unchanged thus do not correlate with the correspondingly variable initial εNd (Fig. 6). The basalts have higher γOs and lower εNd compared with the komatiites. 36 2 Permian – Triassic Magmatic Activity in the Song Da Structure Fig. 5 147 Sm/144Nd for Song Da komatiites (filled circle) and basalts Isotopic Analytical Results Geochemically Song Da rift komatiites are closely similar to Gorgona Cretaceous komatiites.